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2499 pages added, reviewed or updated during the last month (last updated: 18/4/2021)


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T score in bone mineral density measurement

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Bone mineral density may be quoted as the number of standard deviations(SD) from the young adult mean. This is known as the T score.

The World Health Organisation define normal bone density to be within 1 SD of the young adult mean i.e. T score > -1. Osteopenia is defined by a T score between -1 and -2.5. Osteoporosis is defined as a T score less than -2.5.

It should be noted that the WHO definition of osteoporosis encompasses a large proportion of the elderly population and as mentioned elsewhere it is not the only consideration in determining treatment.

Last reviewed 01/2018

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